JP2010068201A - Communication method and communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problem: in communication device having a data error detection function, a correction function and an interleave function, transmission delay between host devices is large. <P>SOLUTION: The communication device performs communication by an encoding function part 72 and a decoding function part 89 without using an interleave function part 74 and a deinterleave function part 84 in an environment where burst errors seldom occur, and performs communication by the interleave function part 74, the deinterleave function part 84, the encoding function part 72 and the decoding function part 89 in an environment where the burst error occurs. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a data error detection / correction method, a communication method having interleaving processing and deinterleaving processing, and a communication apparatus therefor.

  In order to improve the reliability of data communication, an error detection / correction method, a communication method having an interleaving process and a deinterleaving process, or a communication apparatus using the same is used. In general, in data communication, noise or the like is mixed during data transmission and an error occurs in a data bit, resulting in a communication error. For this reason, redundant bits are added to transmission data in advance on the transmission side, and errors are detected and corrected on the reception side.

  Error detection / correction methods for adding redundant bits include, for example, a parity check method for adding a parity bit for each character in transmission data, a Hamming code method for adding several bits of redundant bits to each character, horizontal and vertical A parity check method and a cyclic check method (hereinafter referred to as “CRC”) are known. Of these error detection / correction functions, for example, if CRC is used, it is possible to correct a predetermined number of bit errors and reproduce the data.

  On the other hand, in wireless communication, data is transmitted by radio waves in the air, so that bit errors tend to occur continuously (hereinafter referred to as “burst errors”). If a burst error occurs beyond the capability of the error correction method, the data cannot be reproduced. Therefore, even if a burst error occurs, a method using interleaving / deinterleaving is performed so that error bits that cause bit errors are appropriately scattered in error detection / correction sections (hereinafter referred to as “check sections”) in the data. Is being used. Interleaving is performed by rearranging the transmission order of data on the transmission side, and deinterleaving refers to reassembling received data to original data.

FIG. 9 is a block diagram showing an example of a conventional communication apparatus having a data error detection / correction function and an interleave function.
As shown in the figure, conventional general communication devices are referred to as a transmission-side communication device (hereinafter simply referred to as “transmission-side device”) 30 and a reception-side communication device (hereinafter simply referred to as “reception-side device”). ) 40, and the communication path 34 is connected between them. The higher-level devices 10 and 20 are connected to the transmission-side measure 30 and the reception-side measure 40, respectively, and input / output data to / from the communication device.

  The transmission-side measure 30 includes an encoding function unit 31 having a function of generating redundant bits for error detection / correction of data and adding them to the data, and interleaving that temporarily stores the data in a buffer and rearranges the data transmission order. A function unit 33 is provided.

  The receiving-side measure 40 temporarily stores the received data, re-assembles the received data into the original data, and a decoding function for performing error detection / correction processing on the received data and deleting redundant bits Part 43. The host device is usually a processor such as a microcomputer or a personal computer.

  The host device 10 and the encoding function unit 31 are connected by, for example, a 16-bit data signal line 11. Similarly, between the encoding function unit 31 and the interleaving function unit 33 is a 1-bit data signal line 32, the communication path 34 is a 1-bit communication path, and between the deinterleaving function unit 41 and the decoding function unit 43. A 1-bit data signal line 42 connects the decoding function unit 43 and the host device 20 with a 16-bit data signal line 44.

A communication method in such a communication apparatus will be described with reference to FIGS.
FIG. 10 is an explanatory diagram showing an example of the data format of data transmitted on the data signal lines 11 and 44 of FIG. FIG. 11 is an explanatory diagram showing a data format example of data transmitted on the data signal lines 32 and 42 and the communication path 34 of FIG. 9A shows an example of the data format of data transmitted on the data signal lines 32 and 42 of FIG. 9, and FIG. 9B shows an example of the data format of data transmitted on the communication path 34. .

  Data from the host device 10 is input to the encoding function unit 31, for example, as a 16-bit parallel signal as shown in FIG. In the encoding function unit 31, for example, CRC is used, the data is divided by the generator polynomial, the quotient is added to the data as a redundant bit, and the interleaving function unit 33 is performed in the order of the data format shown in FIG. Is output.

  The data input to the interleave function unit 33 is rearranged in transmission order and output to the communication path 34 in the order of the data format shown in FIG.

  The data output to the communication path 34 is input to the receiving side device 40, specifically, the deinterleave function unit 41, and the reassembling process is performed. The data in the format of FIG. 11B is converted to the format of (a). And output to the decryption function unit 43. In the decoding function unit 43, data input in series is converted into parallel data, and error detection / correction processing is performed. If there is no error in the data, the data is output to the host device 20 in the data format shown in FIG.

  FIG. 12 is an explanatory diagram of deinterleaving for occurrence of a burst error on the communication path 34 in FIG.

  If a 4-bit burst error occurs in the data output from the transmission side measure 30 to the communication path 34, bits C0 to C3 become error bits as shown in FIG. However, since the data is reassembled by the deinterleave function unit 41, the data is as shown in FIG. 12 (b), and the received data can be corrected because there is one error bit in the check section.

  Techniques related to such communication devices are described in the following technical literature, for example.

JP 2002-232300 A

  In the interleave circuit described in Patent Document 1, serially input data is converted into n-bit parallel data, and the converted n-bit parallel data is sequentially written to each address of the memory, and then the memory Sequentially read m pieces of n-bit parallel data stored at each address, and at the time of reading the m number of addresses i (an integer of 1 ≦ i ≦ n), the i th of the read parallel data The data located in the bit is sequentially output m bits.

  However, in a communication apparatus having a data error detection / correction function and an interleave function, the processing time for data recombination / recombination in the interleave function unit 33 and the deinterleave function unit 41 is large, so that the end-to-end (host device 10 And the host device 20) become larger. Furthermore, the interleaving / deinterleaving function works even in an environment where burst errors are unlikely to occur on the communication path 34, resulting in an increase in overhead and an unnecessary transmission delay.

  In order to solve the above problems, the communication method of the present invention performs communication using an error correction mode in which communication is performed using a data error detection and correction method, and a data error detection and correction method, interleaving processing and deinterleaving processing. In the communication method having two modes of interleave mode, when first data composed of a plurality of bits is input, redundant bits for error detection and correction are added to the first data. An encoding process for outputting the second data, an interleaving process for holding the second data, rearranging the output order of the second data and outputting the third data, and the mode switching signal, Selects the second data when the error correction mode is selected, and selects the third data when the mode is the interleave mode. Based on the first selection process for outputting the selected second or third data to the communication channel and the mode switching signal, the second data output from the communication channel when the mode is the error correction mode. When the mode is the interleave mode, the second selection process for outputting the third data and the third data output in the second selection process are input, and the third data is input. Based on the deinterleaving process that outputs the fourth data by reassembling the data output order and the mode switching signal, when the mode is the error correction mode, the second data output in the second process is output. When data is selected and the mode is the interleave mode, the fourth data is selected, and the selected second or fourth data is output. The second or fourth data selected by the selection process and the third selection process is input, and based on the redundant bits, a bit error for the second or fourth data is detected and corrected. According to the detection correction result and the mode at that time, the mode is switched or the mode is maintained as it is, the bit error condition is monitored, the mode is switched or maintained as it is, and a mode switching signal is output. And a decoding process.

  In addition, the communication device of the present invention has two error correction modes: communication using the data error detection / correction function; and interleave mode: communication using the data error detection / correction function, interleave function, and deinterleave function. A communication device having a mode, when first data composed of a plurality of bits is input, redundant bits for error detection and correction are added to the first data to output second data An encoding function unit that holds the second data, and outputs a third data by rearranging the output order of the second data,

  Based on the mode switching signal, the second data is selected when the mode is the error correction mode, the third data is selected when the mode is the interleave mode, and the selected second or third data is selected. Based on the first selector that outputs data to the communication path and the mode switching signal, the second data output from the communication path is output when the mode is the error correction mode, and the mode is the interleave mode. In this case, the second selector that outputs the third data and the third data output from the second selector are input, and the output order of the third data is rearranged to obtain the fourth data. When the mode is the error correction mode based on the deinterleaving function unit to be output and the mode switching signal, the second A third selector that selects the second data output from the selector, selects the fourth data when the mode is the interleave mode, and outputs the selected second or fourth data; The second or fourth data selected by the third selector is input, and a bit error with respect to the second or fourth data is detected and corrected based on the redundant bit, and the detection correction result Decoding that switches the mode or maintains the mode as it is according to the mode at that time, and further monitors the bit error status to switch or maintain the two modes and outputs a mode switching signal And a functional part.

According to the method and the communication apparatus of the present invention, the following effects can be obtained.
In an environment in which a burst error is unlikely to occur, communication is performed using an error detection / correction method without using an interleave method, so that buffering and data re-arrangement / re-arrangement processing are not performed, and unnecessary overhead is eliminated. As a result, an unnecessary delay does not occur. Furthermore, in an environment where a burst error occurs, the mode is switched to a mode that uses interleave processing and deinterleave processing, so that the ability to correct bit errors can be maintained.

  The best mode for carrying out the invention will become apparent from the following description of the preferred embodiments when read in conjunction with the accompanying drawings. However, the drawings are only for explanation and do not limit the scope of the present invention.

(Configuration of Example 1)
FIG. 1 is a configuration diagram illustrating a communication apparatus according to a first embodiment of this invention.

  The communication apparatus according to the first exemplary embodiment of the present invention includes a transmission-side apparatus 70 and a reception-side apparatus 80, which are connected by a communication path 78. The higher-level devices 50 and 60 are connected to the transmission-side device 70 and the reception-side device 80, respectively, and input / output data to / from the communication device.

  The host device 50 and the transmission side device 70 are connected by a 16-bit data signal line 78, and the transmission side device 70 and the reception side device 80 are connected by a 1-bit communication path. The decoding function unit 89, the control unit 71, and the control unit 81 are connected by a reception completion signal line 90 and a mode switching signal line 91. Further, the receiving device 80 and the host device 60 are connected by a 16-bit data signal line 92.

  The internal connection relationship of the transmission side device 70 is as follows. A 16-bit data signal line 51 is connected between the host device 50 and the encoding function unit 72, and a 1-bit data signal line 76 is encoded between the encoding function unit 72 and the first selector 77. The functional unit 72 and the interleave functional unit 74 are connected by a 28-bit data signal line 73, and the interleave functional unit 74 and the selector 77 are connected by a 1-bit data signal line 75, respectively.

  The internal connection relationship of the receiving side device 80 is as follows. A 1-bit communication path 78 is provided between the selector 77 of the transmitting apparatus 70 and the second selector 82 of the receiving apparatus 80, and a 1-bit data signal line is provided between the selector 82 and the third selector 87. 86, a 1-bit data signal line 83 is provided between the selector 82 and the deinterleave function unit 84, and a 1-bit data signal line 85 is provided between the deinterleave function unit 84 and the selector 87. A 1-bit data signal line 88 is connected to the decoding function unit 89, and a 16-bit data signal line 92 is connected between the decoding function unit 89 and the higher-level device 60.

  Hereinafter, each device will be described. The host device 50 outputs 16-bit data to the transmitter device 70 in parallel. The transmission side device 70 includes a control unit 71, an encoding function unit 72, an interleave function unit 74, and a selector 77.

  When receiving the reception completion signal, the control unit 71 has a function of examining the state of the mode switching signal and outputting a control signal to the extraction function unit 74 b and the selector 77 in the interleaving function unit 74.

  The encoding function unit 72 converts the data input from the host device 50 from parallel to serial, assigns redundant bits for error detection / correction, and outputs them to the selector 77. It has a function of giving redundant bits to the data and outputting the data to the interleave function unit 74 in parallel.

  The interleave function unit 74 has a buffer unit 74a, holds input data from the encoding function unit 72, and reorders the bit order of the data in the extraction function unit 74b according to an instruction from the control unit 71. It has a function to output.

  The selector 77 has a function of selecting either input data from the encoding function unit 72 or input data from the interleave function unit 74 in accordance with an instruction from the control unit 71 and outputting the selected data to the receiving side device 80. .

  The receiving side device 80 includes a control unit 81, a selector 82, a selector 87, a deinterleave function unit 84, and a decoding function unit 89. When receiving the reception completion signal, the control unit 81 has a function of checking the state of the mode switching signal and outputting a control signal to the selector 82 and the selector 87.

  The selector 82 has a function of selecting either the deinterleave function unit 84 or the selector 87 in accordance with an instruction from the control unit 81 and outputting data from the transmission side device 70. The deinterleaving function unit 84 has a buffer unit 84a, and has a function of holding data from the selector 82, and rearranging the order of bits by the restoration function unit 84b and outputting it to the selector 87.

  The selector 87 selects input data from the deinterleave function unit 84 or input data from the selector 82 in accordance with an instruction from the control unit 81, and outputs the selected data to the decoding function unit 89.

  The decoding function unit 89 converts the input data from the selector 87 from serial to parallel, performs error detection / correction and removal of redundant bits, and outputs the data to the host device 60 in parallel. The decryption function unit 89 outputs a reception completion signal after the reception process for the input data from the selector 87 is completed. In addition, the status of bit errors is monitored and the mode switching signal is controlled. The decryption function unit 89 outputs the data to the host device 60 in parallel.

(Communication method of Example 1)
According to FIG. 1, (1) processing when no error is detected, (2) processing when random error is detected, (3) processing when first burst error is detected, (4) processing after second burst error detection, And (5) The description will be divided into five patterns of transition from the interleave mode to the error correction mode.

  The communication apparatus according to the present embodiment has an error correction mode in which communication is performed using an error correction function without using an interleaving and deinterleaving function, and an interleaving and deinterleaving in addition to an error correction function, depending on a communication error occurrence state. Communication is performed by switching between two modes of the interleave mode using the function. When the communication device starts communication, it is in an initial state, and communication is started in the error correction mode.

(1) Processing when no error is detected FIG. 2 is an explanatory diagram showing a data format example of data transmitted on the data signal lines 51 and 92 in FIG. FIG. 3 is an explanatory diagram showing an example of the data format of the encoded data and the interleaved data transmitted on the data signal line in FIG. FIG. 4 is an explanatory diagram showing an example of the data format of data transmitted on the data signal line 73 in FIG. FIG. 5 is an explanatory diagram showing the switching timing between the error correction mode and the interleave mode.

  As shown in FIG. 2, the encoding function unit 72 inputs 16-bit data signals from the host device 50 in parallel. The encoding function unit 72 converts this received signal from parallel to serial, adds redundant bits for error detection / correction, and outputs them to the selector 77 in the format shown in FIG. In the encoding process for adding redundant bits for error detection / correction, for example, CRC is used, data is divided by a generator polynomial, and the quotient is added to the data as redundant bits.

  At the same time, the encoding function unit 72 encodes the data input in parallel and outputs the data to the interleave function unit 74 in the format shown in FIG. The interleave function unit 74 writes the data input from the encoding function unit 72 to the buffer unit 74a. Since the communication apparatus according to the present embodiment is in the error correction mode at this time, the mode switching signal is disabled in the interleave in the control unit 71. For this reason, the control unit 71 instructs the selector 77 to output the input data from the encoding function unit 72 to the receiving side device 80, and the selector 77 executes this.

  Similarly, the selector 82 outputs the received data from the transmission side device 70 to the selector 87 in accordance with an instruction from the control unit 81. The selector 87 outputs the data received from the selector 82 to the decryption function unit 89 based on an instruction from the control unit 81. The decoding function unit 89 converts the data received from the selector 87 from serial to parallel, and performs a decoding process for detecting and correcting bit errors and removing redundant bits. After the decoding is completed, a reception completion signal is output to the control units 71 and 81. At this time, since no error is detected, the mode switching signal remains in the interleave invalid state. Therefore, the error correction mode is continued as shown in FIG.

(2) Processing when a random error is detected FIG. 6 is an explanatory diagram showing two types of error occurrence on the communication path in FIG.

  FIG. 6A shows a situation in which a 4-bit random error has occurred in the data transmitted from the transmitting apparatus to the receiving apparatus. FIG. 4B shows a situation where a 4-bit burst error has occurred in the data. In FIG. 9A, when a random error occurs in the received data and the decoding function unit 89 detects a bit error that can be corrected, the decoding function unit 89 converts the input data from serial to parallel. After decoding, the reception completion signal is output after decoding is completed. At this time, since the error bit is 1 bit during the check interval, the error is corrected, and the mode switching signal remains in the interleave invalid state. Therefore, the error correction mode is continued. In this case, an inspection area means A0-G0, A1-G1, A2-G2, and A3-G3.

(3) Processing when first burst error is detected In FIG. 6B, when the first burst error occurs on the communication path 78, the communication apparatus of the embodiment is in the error correction mode and is input to the selector 82. The data thus transmitted is transmitted from the selector 82 on the data signal line 86 to the selector 87 according to an instruction from the control unit 81, and further transmitted on the data signal line 88 from the selector 87 to be output to the decoding function unit 89. The decoding function unit 89 performs decoding by converting the data input from the selector 87 from serial to parallel, and detects an error that cannot be corrected during the check interval after the decoding is completed. The decoding function unit 89 makes the mode switching signal interleave valid, and outputs a reception completion signal to the control units 71 and 81. At this time, data is not output to the host device 60. The control units 71 and 81 check the mode switching signal at the timing when the reception completion signal is received, and since the interleaving is valid, the mode of the communication device is switched from the error correction mode to the interleaving mode. Next, retransmission is performed on the above data that cannot be corrected due to a burst error.

FIG. 7 is an explanatory diagram showing the recombination operation of the extraction function unit in FIG.
Data in which a burst error has occurred in the communication path 78 is written and held in the buffer unit 74 a in the interleave function unit 74. The held data is read from the buffer unit 74 a according to an instruction from the control unit 71, and a recombination process as shown in FIG. 7 is performed by the extraction function unit 74 b and output to the selector 77.

  That is, the data DA1 read from the buffer unit 74a is A0, B0, C0, D0, E0, F0, G0, A1, B1, C1, D1, E1, F1, G1, A2, B2, as shown in FIG. C2, D2, E2, F2, G2, A3, B3, C3, D3, E3, and F3 are arranged. The extraction function unit 74b outputs A0, A1, A3, A3, B0, B1, B2, B3,... F0, F1, F2, F3, G0, G1, G2, G3 as output data DA2. Rearrange as follows.

  The selector 77 retransmits the data output from the extraction function unit 74b of the interleave function unit 74 to the reception side device 80 in the format of FIG. The selector 82 inputs data output from the transmission side device 70 in accordance with an instruction from the control unit 81 and outputs the data to the deinterleave function unit 84.

FIG. 8 is an explanatory diagram showing a reassembly operation of the restoration function unit 84b in FIG.
The deinterleave function unit 84 writes the data input from the selector 82 to the buffer unit 84 a, the restoration function unit 84 b reads this data, reassembles it as shown in FIG. 8, and outputs it to the selector 87. The recombination operation is the reverse of the recombination operation. The selector 87 outputs the data input from the deinterleave function unit 84 to the decryption function unit 89 in the format of FIG.

  The decoding function unit 89 converts the data received from the selector 87 from serial to parallel and performs decoding. After the decoding is completed, the decoding function unit 89 outputs a reception completion signal and outputs the data to the host device 60. The mode switching signal maintains the interleaving effect and continues the interleaving mode as shown in FIG.

(4) Processing after second burst error detection When a second or subsequent burst error occurs, the communication apparatus of the present embodiment operates as (3) almost the same operation as when the first burst error occurs. I do. However, the mode switching signal is valid for interleaving when the first burst error occurs, and is maintained when the second and subsequent burst errors occur.

(5) Transition from Interleave Mode to Error Correction Mode The decoding function unit 89 has a statistical information collection function, and performs mode transition when the frequency of errors becomes low. That is, at the time of decoding, the decoding function unit 89 counts the number of detected or undetected errors for each received data, and if an error is not detected exceeding a certain number of data, an environment in which errors do not occur frequently is obtained. As a result, the mode switching signal is changed to the error correction mode, and the interleave mode is changed to the error correction mode as shown in FIG.

(Effect of Example 1)
The first embodiment has the following effects.

  In an environment where a burst error is unlikely to occur, the error detection / correction function of the encoding function unit 72 and the decoding function unit 89 performs communication without using the interleaving function unit 74 and the deinterleaving function unit 84. Data rearrangement / recombination processing is not performed, and unnecessary overhead is eliminated. As a result, an unnecessary delay does not occur. Furthermore, in an environment where a burst error occurs, the ability to correct bit errors can be maintained because the interleave mode is switched to the interleave mode using the interleave function unit 74 and the deinterleave function unit 84.

(Modification)
The present invention is not limited to the first embodiment, and various usage forms and modifications are possible. For example, the following forms (a) to (d) are used as the usage form and the modified examples.

  (A) In the first embodiment, the high-level device 50 and the transmission-side device 70 and the high-level device 60 and the reception-side device 80 are described as being connected by a 16-bit data signal line. It is possible to use any number of bits that can be designed without being limited to the above. Similarly, the bit lengths of the other data signal lines in this embodiment are not limited.

  (B) The communication device according to the first embodiment may be connected to a personal computer or the like as an independent device, or may be incorporated into a mobile phone.

  (C) The communication path may be any of wireless communication, wired communication, satellite communication, and the like, and is not particularly limited.

It is a block diagram which shows the communication apparatus of Example 1 of this invention. It is explanatory drawing which shows the data format example of the data transmitted on the data signal lines 51 and 92 in FIG. FIG. 3 is an explanatory diagram showing an example of the data format of the encoded data and the interleaved data transmitted on the data signal line in FIG. It is explanatory drawing which shows the data format example of the data transmitted on the data signal line 73 in FIG. It is explanatory drawing which shows the switching timing between error correction mode and interleave mode. It is explanatory drawing which shows two types of error occurrence on the communication path in FIG. It is explanatory drawing which shows the recombination operation | movement of the extraction function part 74b in FIG. It is explanatory drawing which shows the reassembly operation | movement of the decompression | restoration function part 84b in FIG. It is a block diagram which shows the example of the conventional communication apparatus which has a data error detection and correction function, and an interleave function. It is explanatory drawing which shows the data format of the data transmitted on the data signal lines 11 and 44 of FIG. It is explanatory drawing which shows the data format example of the data transmitted on the data signal lines 32 and 42 of FIG. 9, and the communication path. It is explanatory drawing of deinterleaving of the burst error generation on the communication path 34 of FIG.

Explanation of symbols

70 Transmission side device 80 Reception side device 78 Communication path 50, 60 Host device 72 Encoding function unit 89 Decomposition function unit 74 Interleave function unit 84 Deinterleave function unit 77, 82, 87 Selectors 71, 81 Control unit

Claims (4)

An error correction mode for performing communication using a data error detection and correction method;
A communication method having two modes of an interleave mode for performing communication using a data error detection and correction method, an interleave process, and a deinterleave process,
An encoding process for outputting second data by adding redundant bits for error detection and correction to the first data when first data composed of a plurality of bits is input;
An interleaving process that holds the second data and outputs the third data by rearranging the output order of the second data;
Based on the mode switching signal, the second data is selected when the mode is the error correction mode, the third data is selected when the mode is the interleave mode, and the selected second or third data is selected. A first selection process for outputting data to the communication path;
Based on the mode switching signal, the second data output from the communication channel is output when the mode is the error correction mode, and the third data is output when the mode is the interleave mode. Selection process,
A deinterleaving process that inputs the third data output in the second selection process, outputs the fourth data by reassembling the output order of the third data;
Based on the mode switching signal, when the mode is the error correction mode, the second data output in the second process is selected, and when the mode is the interleave mode, the fourth data is selected. A third selection process for outputting the selected second or fourth data;
The second or fourth data selected by the third selection process is input, and based on the redundant bit, a bit error with respect to the second or fourth data is detected and corrected. Decoding processing for switching the mode or maintaining the mode as it is according to the mode at that time, and further, monitoring the bit error status, switching or maintaining the mode, and outputting a mode switching signal; A communication method characterized by comprising: An error correction mode for performing communication using a data error detection and correction method;
A communication method having two modes of an interleave mode for performing communication using a data error detection and correction method, an interleave process, and a deinterleave process,
An encoding process for outputting second data by adding redundant bits for error detection and correction to the first data when first data composed of a plurality of bits is input;
An interleaving process that holds the second data and outputs the third data by rearranging the output order of the second data;
Based on the mode switching signal, the second data is selected when the mode is the error correction mode, the third data is selected when the mode is the interleave mode, and the selected second or third data is selected. A first selection process for outputting data to the communication path;
Based on the mode switching signal, the second data output from the communication channel is output when the mode is the error correction mode, and the third data is output when the mode is the interleave mode. Selection process,
A deinterleaving process for inputting the third data output in the second process, reconfiguring the output order of the third data, and outputting a fourth data;
Based on the mode switching signal, when the mode is the error correction mode, the second data output from the second selector is selected, and when the mode is the interleave mode, the fourth data is selected. A third selection process for outputting the selected second or fourth data;
A bit error detection and correction step of inputting the second or fourth data selected by the third selector and detecting and correcting a bit error with respect to the second or fourth data based on the redundant bits;
This detection correction result,
When no bit error is detected or correctable and the mode is the error correction mode, the mode remains in the error correction mode;
When no bit error is detected or correctable and the mode is the interleave mode, the mode remains in the interleave mode;
When a bit error cannot be corrected and the mode is the error correction mode, the mode is set to an interleave mode,
When a bit error cannot be corrected and the mode is the interleave mode, the mode remains the interleave mode,
A first mode switching step for outputting a mode switching signal and a reception completion signal;
If the number of received data and the number of bit errors are counted and a bit error does not occur beyond a certain number of received data, a second mode switching step for setting the mode to an error correction mode when the mode is the interleave mode A decryption process comprising:
A first control process for inputting and storing the mode switching signal and outputting the mode switching signal to the interleave function unit and the first selector when the reception signal is input;
A second control process for inputting and storing the mode switching signal and outputting the mode switching signal to the second selector and the third selector when the received signal is input;
A communication method characterized by comprising: An error correction mode for performing communication using a data error detection and correction function, and
A communication apparatus having two modes of an interleave mode for performing communication using a data error detection correction function, an interleave function, and a deinterleave function,
An encoding function unit that outputs a second data by adding redundant bits for error detection and correction to the first data when the first data composed of a plurality of bits is input;
An interleave function unit that holds the second data and outputs third data by rearranging the output order of the second data;
Based on the mode switching signal, the second data is selected when the mode is the error correction mode, the third data is selected when the mode is the interleave mode, and the selected second or third data is selected. A first selector for outputting data to the communication path;
Based on the mode switching signal, the second data output from the communication channel is output when the mode is the error correction mode, and the third data is output when the mode is the interleave mode. A selector,
A deinterleave function unit that inputs the third data output from the second selector, outputs the fourth data by rearranging the output order of the third data, and
Based on the mode switching signal, when the mode is the error correction mode, the second data output from the second selector is selected, and when the mode is the interleave mode, the fourth data is selected. A third selector for outputting the selected second or fourth data;
The second or fourth data selected by the third selector is input, and based on the redundant bit, a bit error with respect to the second or fourth data is detected and corrected. Decoding function that switches the mode or maintains the mode as it is according to the mode at the time, and further monitors the bit error status to switch or maintain the two modes and outputs a mode switching signal And
A communication apparatus comprising: An error correction mode for performing communication using a data error detection and correction function, and
A communication apparatus having two modes of an interleave mode for performing communication using a data error detection correction function, an interleave function, and a deinterleave function,
An encoding function unit that outputs a second data by adding redundant bits for error detection and correction to the first data when the first data composed of a plurality of bits is input;
An interleave function unit that holds the second data and outputs third data by rearranging the output order of the second data;
Based on the mode switching signal, the second data is selected when the mode is the error correction mode, the third data is selected when the mode is the interleave mode, and the selected second or third data is selected. A first selector for outputting data to the communication path;
Based on the mode switching signal, the second data output from the communication channel is output when the mode is the error correction mode, and the third data is output when the mode is the interleave mode. A selector,
A deinterleave function unit that inputs the third data output from the second selector, outputs the fourth data by rearranging the output order of the third data, and
Based on the mode switching signal, when the mode is the error correction mode, the second data output from the second selector is selected, and when the mode is the interleave mode, the fourth data is selected. A third selector for outputting the selected second or fourth data;
A bit error detection and correction function for inputting the second or fourth data selected by the third selector and detecting and correcting a bit error for the second or fourth data based on the redundant bits;
This detection correction result,
When no bit error is detected or correctable and the mode is the error correction mode, the mode remains in the error correction mode;
When no bit error is detected or correctable and the mode is the interleave mode, the mode remains in the interleave mode;
When a bit error cannot be corrected and the mode is the error correction mode, the mode is set to an interleave mode,
When a bit error cannot be corrected and the mode is the interleave mode, the mode remains the interleave mode,
A first mode switching function for outputting a mode switching signal and a reception completion signal;
A second mode switching function that counts the number of received data and the number of bit errors and sets the mode to an error correction mode when the mode is in the interleave mode unless a bit error occurs beyond a certain number of received data A composite function unit comprising:
A first control unit that inputs and stores the mode switching signal and outputs the mode switching signal to the interleave function unit and the first selector when the reception signal is input;
A second control unit that inputs and stores the mode switching signal and outputs the mode switching signal to the second selector and the third selector when the reception signal is input;
A communication apparatus comprising:

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